figure 1 It is a schematic diagram of the overall structure of the present invention. figure 1 In addition to the gun head 8, the gun shell 9, the switch 5, the trachea 6, and the LED warning light 7, the treatment gun is also equipped with a protective frame 1, a flow valve 2, a three-color LED light 3, a temperature sensor 4, etc.
 In the present invention, the gun head 8 is arranged at the front end of the gun housing 9, the air pipe 6 is arranged at the rear of the gun housing 2, the switch 5 is arranged on the waist side of the gun housing 9, and the LED warning light 7 is arranged on the waist back side of the gun housing 9. Switch 5 is used to control the start and close of the treatment gun, after a long press, CO 2 Can be sprayed continuously. CO 2 It sprays from the gas cylinder, passes through the trachea 6 and reaches the treatment gun. The LED warning light 7 indicates whether the preset time is reached and the temperature is below +4°C.
 Such as figure 2 As shown, one of the improvements of the present invention is that a flow valve 2 for controlling the flow rate is installed on the nozzle of the gun head 8.
 The second improvement of the present invention is that the flow valve 2 is made of low-temperature resistant materials such as low-temperature steel. The low-temperature toughness ensures that the mechanical strength and processing performance are high enough at low temperatures. During the process from low temperature to operating temperature, it will not happen. Thermal stress causes cracking. It can fully endure the thermal cycle from low temperature to room temperature. At the same time, it has outstanding resistance to various corrosive media.
 CO 2 When the liquid is flowing, the pressure and flow of the liquid are changed by the flow valve 2. The flow valve 2 adopts manual control, which has high reliability of action, is not sensitive to pollution, small shock and vibration during operation, good sealing performance, compact structure and great versatility. CO 2 Stored in a high-pressure aluminum alloy seamless gas cylinder (generally ≤7MPa), if it is directly discharged through a pressure hose, the spray pressure of the treatment gun nozzle will far exceed 7MPa, even if the spray pressure is the same as that in the gas bottle, but the human body The inability to withstand such a high pressure not only increases the difficulty and danger of operation, but also causes unpredictable harm to the patient. Therefore, it is necessary to reduce the ejected pressure to a pressure acceptable to the human body, a pressure of about 2 Bar. Therefore, the flow valve 2 plays a role in controlling the emission of CO 2 The function of pressure and flow.
 Flow valve 2 is in normally closed mode. When the switch 5 of the treatment gun is pressed, the coil is energized, the pilot valve core is closed, the pilot hole is opened, the upper cavity of the valve is relieved, the piston is pushed by the pressure of the lower cavity, and the flow valve 2 is opened. When the switch of the treatment gun is released, the coil is powered off, the pilot valve core is reset, the pilot hole is closed, and the flow valve 2 is closed.
 Such as image 3 , 4 As shown, in the third improvement of the present invention, a protective frame 1 is further provided in front of the flow valve 2 and at the front end of the gun head, and the protection frame 1 is inserted into the front end of the treatment gun in a plug-in manner. It is easy to install and prevents the risk of the protective frame falling off the treatment pipette tip.
 Such as image 3 As shown, the protective frame 1 is made of metal material and has a circular arc shape. The lower half is non-closed. The temperature sensor can be placed on the gun head, which maximizes the use of the space of the gun head and also protects the temperature sensor. effect. The size of the protective frame 1 is the same as the head of the treatment gun, which does not increase the space occupied by the treatment gun, and does not cause unnecessary contact with other objects.
 The protective frame 1 can not only prevent the nozzle and temperature sensor from rupturing under severe impact, falling, etc., but also can effectively prevent the nozzle from being too close to the human body and causing risks, or touching the nozzle with dirt, foreign objects and other pollution. And temperature sensor. The invention uses the arc-shaped protective frame to comprehensively protect the LED lamp, the spray head, the temperature sensor, etc., without affecting the functions of each component.
 The fourth improvement of the present invention is that a non-contact temperature sensor 4 is also provided in front of the gun head 8 and behind the protective frame 1. The sensitive element of the non-contact temperature sensor 4 does not contact with the measured object. It can measure the surface temperature of moving objects, small targets and objects with small heat capacity or rapid temperature changes (transient). It can also be used to measure the temperature distribution of the temperature field. . The temperature sensor 4 combines the overall use situation and uses a local cold therapy method, preferably an infrared thermometer, that is, a spot thermometer, which has the advantages of fast response time, non-contact, safe use and long service life. This equipment uses the German Optris compact infrared thermometer CS series OPTCSTCLT15 type, the temperature sensor can fully meet the requirements of low-temperature impact analgesia.
 The infrared thermometer can directly measure the temperature of the target without touching the target. Its working principle is to calculate the temperature of the surface of the object by measuring the infrared intensity emitted by the target, and quickly feedback it to the control system. The biggest advantage of the infrared thermometer in non-contact measurement makes the spray gun head can easily and quickly measure the approaching or moving objects. After the dry ice acts on the skin, the human skin quickly cools down, so the shorter the response time to the temperature sensor, the better, and the shorter response time avoids cold burns caused by low skin temperature without timely feedback.
 The infrared thermometer is composed of optical system, photodetector, signal amplifier, signal processing, display output and other parts. The optical system condenses the infrared radiation energy of the target in its field of view, and the size of the field of view is determined by the optical parts and positions of the thermometer. The infrared energy is focused on the photodetector and converted into corresponding electrical signals. The signal passes through the amplifier and signal processing circuit, and is converted into the temperature value of the measured target after being corrected according to the algorithm in the instrument and the target emissivity.
 The temperature that the low temperature shock analgesia needs to measure is the temperature of the human skin surface and the skin temperature after dry ice treatment (the device stops working below -1°C), and the measurement range of the temperature sensor is below -1°C.
 Because there is a certain distance between the treatment gun tip and the skin, and the measurement diameter is not easy to be too large, such as Figure 5 As shown, the fifth improvement of the present invention is to control the suitable light path of the temperature sensor to 60-80mm, so that the temperature of the skin treatment point can be measured, and the temperature around the treatment point can be taken into account.
 The selection of the temperature sensor 4 is not limited to the above-mentioned preferred embodiment. Due to the close distance between the temperature sensor and the nozzle of the flow valve, the dry ice sprayed from the nozzle causes the surrounding temperature to be low, which requires the temperature sensor to operate normally at low temperatures, without frosting and other requirements, and to withstand ambient temperature without cooling- 78°C is the best. Through comprehensive consideration of the infrared thermometer's performance indicators, such as temperature measurement range, target size, distance coefficient (optical resolution), response time, signal processing function, and environment and working conditions, it is used to determine the temperature sensor.
 Such as Image 6 , 7 As shown, the sixth improvement of the present invention is that on both sides of the nozzle of the gun head 8 and behind the protective frame 1, there are LED lights 3 displaying red, yellow and blue. According to the introduction in the background art, different lights have different effects on the skin. Therefore, the three colors of red, green and blue lights are provided in the present invention, which can be used alone or in combination to enhance the therapeutic effect. Among them, red light: the same frequency as the moxibustion used in acupuncture, which is very useful for the treatment of trigger points or acupuncture points. Blue light: It replenishes oxygen for tissues, has a sterilizing effect, especially anaerobic bacteria; it can clean the skin and prevent infection. Green light: Calm the skin, such as for beauty.
 Such as Picture 8 As shown, the seventh improvement of the present invention is that the feedback control and indication system of the treatment gun formed by the flow valve 2, the temperature sensor 4, the LED lamp 3, and the LED warning lamp 7 can be a good risk control measure. The key point temperature and preset time of the temperature sensor 4 are reminded by the LED warning light 7: the operator needs to set a treatment time before treatment to prevent damage to the patient due to too long treatment time, through the green grass at the back of the treatment gun The LED warning light 7 reminds and decides whether to continue treatment according to the actual treatment effect; when the skin temperature reaches 4℃ or below, the best treatment effect can be achieved, in order to remind the operator whether the current skin temperature of the patient has reached the maximum For better treatment effect, an LED warning light 7 is installed at the back of the treatment gun. When the best treatment effect is reached, the orange LED warning light will light up; when the skin temperature reaches -1℃ or below, it will cause damage to human cells, so it is When the temperature reaches -1°C and below, the device automatically stops working to prevent possible risks caused by continued treatment. In this way, the temperature sensor 4 feedback controls the device to stop working.
 The overall process is:
 (1) After the equipment is turned on, the operator sets a treatment time according to the patient's condition, and selects the corresponding LED light 3;
 (2) The operator holds the treatment gun, presses the switch lightly, the set LED light turns on, the temperature sensor starts, and the temperature parameters on the touch screen can be viewed in real time, indicating that the treatment gun starts to work;
 (3) Point the tip of the treatment gun at the patient's treatment site, press and hold the switch of the treatment gun, the flow valve opens, and the CO 2 The dry ice is sprayed onto the patient's skin through the nozzle, and the device starts timing, and the temperature sensor detects the skin temperature in real time;
 (4) When the timer reaches the preset treatment time, the grass green LED warning light at the back of the treatment gun lights up, and the operator decides whether to continue treatment according to the actual situation. If not, release the switch and the equipment will stop working;
 (5) When the temperature sensor monitors that the skin temperature reaches 4°C or below, the orange LED on the back of the treatment gun will light up to remind the operator that the best treatment effect has been reached at this time;
 (6) When the temperature sensor monitors the skin temperature to reach -1℃ and below, the device automatically stops all work to avoid harm to the patient.